Its not always class D vs class AB, Its more to do with the components used inside and how they are put together and implementation, the fair comparison is the model 30 to model 40n but I shared what was on demo.
The difference in presentation will be there due to the different topologies used for eg. one might have more detail and control in the bass region the other might be more detailed and airy in the upper mids and treble but its not like the model 40n will sound like a pm8006 just becasue they are class AB. The issues that were there with the lintons and pm8006 and A14 mkII were almost non existent when paired with the dentons 2way. Thats how I was able to make out the forwardness of the rotel against the warm, rounded more easy going presentation of the pm8006.
I missed a point in the previous post be it the pm8006 or the model 30, I did not find either to be neutral or or the cooler side, both retained the warm, easy going, rounded signature with the model 30 presenting it in a more easy, open and balanced way. The rotel is what was more neutral to cooler and forward sounding with respect to the upper midrange.
Brands aim towards a term 'house sound' and try to keep as close to it with all their models. No brand will want their products to have different sound signatures and tone. Thats just not good business.
With the lintons the better the amplification the better they perform.